Eviction without Aggrement

keep a check on her that she doesnt transfer the utilities to her name. also you can write a letter to the chairman of the society stating that you have allowed your sister in law tostay in your premises gratuituosly due to her personal problems and to take care of her and not bother her for any maintenance dues etc and that the same will be paid by you and to take care of her.

this will safeguard your rights and at the same time not make your sister in law think otherwise.
 

Thanks, So if I make sure all utilities and society dues are paid by me then there wont be any risk in this right?

no. but make sure you right that letter.

Thanks Will do as Advised..